Why does sqlmigrate need a connection to an existing database?

Wondering why sqlmigrate needs a connection to an existing database.

I understand that for certain commands, it needs the database to generate the migration. But for most (basic) commands, no connection is really needed.

For example, I created a test project and generated migration files. Without ever running the `migrate` command, I was able to use `sqlmigrate` perfectly well on all migrations, save the last, which drops a `unique_together`.

I'm sure there are other commands which actually need a database connection (though I haven't found them yet). Seems to me sqlmigrate could be rewritten along the lines of:

• Try to generate sql from migration file
  
• If it hits a command it needs the database, attempt to connect

Or else:

• If no connection, check if migration file needs connection to database
  

Is there something I'm unaware of?

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